While a can of mace or mad karate skills are still great ideas, self-defense pundits are now saying that a quick pic with a camera phone might be your best defense against pervs flashing themselves in public.

Public humiliation seems to be the key. These guys don't want anyone to know what they're doing, and a picture does speak more than a thousand words...especially if posted on the inside wall of the subway or given to the police department. — Wendy Boswell